NSE 7 – Enterprise Firewall 7.0 — Question 15

Which statement about the designated router (DR) and backup designated router (BDR) in an OSPF multi-access network is true?

Answer options

• A. Only the DR receives link state information from non-DR routers.
• B. Non-DR and non-BDR routers form full adjacencies to DR only.
• C. Non-DR and non-BDR routers send link state updates and acknowledgements to 224.0.0.6.
• D. FortiGate first checks the OSPF ID to elect a DR.

Correct answer: C

Explanation

Option C is correct because in OSPF, non-DR and non-BDR routers send their link state updates to the multicast address 224.0.0.6, which is designated for the DR and BDR. Option A is incorrect because non-DR routers also send updates to the BDR, not just the DR. Option B is wrong as non-DR and non-BDR routers do not form full adjacencies with the DR only; they remain in a different state. Option D is misleading because the OSPF election process does not prioritize FortiGate's initial check of OSPF IDs for DR selection.